The issue of selecting pipe wall thickness
Thread Content
DN125 pipe, pressure requirement of 6MPA; flanges are easily available. What wall thickness should be chosen for the pipes? ? ? ? Please give me some advice, thank you :)
. . . . It really drops fast~~~
It is recommended that you refer to clause 7.1 on page 13 and clause 8.2 on page 21 of the petrochemical standard \"SH 3059-2001 Guidelines for the Selection of Petrochemical Pipeline Equipment\"; these sections provide detailed requirements and calculation formulas for selecting pipeline wall thicknesses! Of course, many design manuals provide information on the methods for calculating pipe wall thickness, but since it is design work, it is best to refer to design standards! In this way, it can be presented with a basis. For reference only!
There is no standard specification. For carbon steel, choose a thickness of 10 mm or more; for stainless steel, choose a thickness of 6 mm or more.
Your company must have a specification sheet for pipe fittings that lists the materials available for pipes! It contains detailed information, allowing you to select the appropriate pipes and fittings based on the medium temperature and pressure level! Moreover, under each pressure level, there are multiple subcategories depending on the medium. Generally, as the original poster said, 8mm thickness is sufficient. If it is a granular solid and the pipes are prone to wear, pipes with a wall thickness of 9–10 mm can be chosen. I suggest the original poster consult experts in pipeline materials; I’m just an amateur trying to offer advice – I can only share what I know!
Calculated according to GB150 standard, the thickness is d = PD/(2φ + p) + 2–3 mm. Here, d represents the thickness, p represents the pressure, D represents the outer diameter, φ represents the weld coefficient, and it represents the allowable stress of the steel material at the design temperature. The value 2–3 represents the corrosion allowance
Material and corrosion should also be considered
It shall be calculated in accordance with GB50316-2000 (2008 edition)
Shouldn’t the use of DN125 and Dn225 pipes and fittings be avoided? Chemical Process Design Manual (3rd Edition) 4-65, DN125, Sch80 pipe, outer diameter 139.7mm, wall thickness 10.0mm
I’d like to ask about the 9th floor: why is it necessary to avoid using pipes and fittings of DN125 and DN225 sizes?
DN125, Dn225, and DN65 are not common specifications; they belong to the American and European series, and their outer diameters differ. Foreign engineering companies avoid using them. Last edited by yzq2213 on 2009-2-28 at 16:55.]